Dolly extension



G. A. DE GRAFF.

DOLLY EXTENSION. APPLICATION FILED JULY 12. 1919.

Patented Apr. 6, 1920.

r x m6 6 mm E f w W I Q W M [w W h m 7 UNITED STATES PATENT FFICE.

GEORGE A. DE GRAFF, 0F MILWAUKEE, VIISCONSIN, ASSIGNOR 0F ONE-HALF TO HENRY J. SMITH, OF CHICAGO, ILLINOIS.

DOLLY EXTENSION.

Specification of Letters Patent.

Patented Apr. 6, 1929.

Application filed July 12, 1819. Serial No. 310,473.

To all whom it may concern:

Be it known that I, GEORGE A. DE GRAPE, a citizen of the United States, and a resident of Milwaukee, in the county of lililwaukee and State of Wisconsin, have invented new and useful Improvements in Dolly Extensions, of which the following is a full, clear, and exact description.

Among the principal objects which the present invention has in view are: To increase the efficiency of the dolly when used in conjunction with jam riveters to the operating position of the dolly and the set carried thereby; and to steady the operation of the dolly.

Drawings.

Figure 1 is a side view of a dolly and a set of usual construction, operatively connected by a short extension constructed in accordance with the present invention.

Fig. 2 is a side view of a longer extension showing a set carried thereby.

Description.

Heretofore, pneumatic dollies such as indicated in the drawings by the numeral 7 have been employed in conjunction with sets such as indicated in the drawings by the numeral 8. Each set S has in the head thereof, a shaping cup 9 to receive one end of a rivet for heading the same. The set has a shank 10 which in practice fits, closely, an orifice provided therefor in the top of the dolly 7.

The dolly 7 is preferably heavy and is provided with a hollow chamber into which the shank 10 extends. /Vhen compressed air is admitted to this chamber, it forces the set outward holding the shaping cup 9 in operative position while the compressed air in the chamber cushions the blow imparted by the riveter at the opposite end of the rivet when same is being headed over. The weight of the dolly 7 serves to absorb the shock, and by reason of the inertia thereof, to resist the blow on the rivet.

Heretofore, it has been the practice to raise the dolly 7 so that the cup-shaped end of the set rests initially against the soft metal of the rivet. Many forms and meth ods have been devised for holding the dolly in its initial position. The diminution of the rivet due to the shaping of the end in the shaping cup 9 has been compensated by the lift of the compressed air in the dolly 7.

I other extension.

Objection has been raised to the method of the above described method of handling the dolly due to the difliculty of obtaining and maintaining the proper support for the dolly. ll hen operating with the present invention, the above stated objection is overcome by introducing between the set and the dolly, one or more of the extensions 11.

In practice the extensions 11 are produced in sets, the lengths vary to accommodate difl'erent requirements of the work performed. I

Each of the extensions 11 has shank 12 and a cap-collar 13. The shank 12 is made to fit the orifice in the dolly 7 above referred to as provided to receive the shank 10 of the set. At the opposite end of the extension 11, a socketed end 14: is formed to receive the shank 10 of the set 8. In practice the socketed end 1% and the shank 12 are identical in shapes and dimensions. The end of the intervening space, however, varies from that shown in 1 to that shown in Fig. 2 of the drawings.

It is obvious that the location of the work to be performed by the aid of the dolly may be tlarther remove-d from the foundation on which the dolly rests and into which the crick-point 15 thereof has a bearing. This mserepancy may be accommodated by coupling two or more extensions together. 'lo this end the shank 12 of one of the extensions fits the socket of the end 141 in an- By thus using extensions of fferent ends adapted for coupling each to the other and for forming a socket for the set and a liftin shank for the dolly any cap, between the foundation on which the dolly rests and the position where the work to be performed by the dolly, may be accommodated.

Claim.

The combination of a dolly having a compressed air chamber provided with an entering orifice; a set having a shank adapted to fit within said chamber through said orilice. said set having a forming socket in- GEORGE A.-. DE GRAFF. 

